These phrases carry special power: they have an uncanny ability to make you look bad even when the words are true.

Worst of all, there’s no taking them back once they slip out.

I’m not talking about shocking slips of the tongue, off-color jokes, or politically incorrect faux pas. These aren’t the only ways to make yourself look bad.

Often it’s the subtle remarks—the ones that paint us as incompetent and unconfident—that do the most damage.

No matter how talented you are or what you’ve accomplished, there are certain phrases that instantly change the way people see you and can forever cast you in a negative light. These phrases are so loaded with negative implications that they undermine careers in short order.

How many of these career killers have you heard around the office lately?

1. “It’s not fair.”

Everyone knows that life isn’t fair. Saying it’s not fair suggests that you think life is supposed to be fair, which makes you look immature and naïve.

If you don’t want to make yourself look bad, you need to stick to the facts, stay constructive, and leave your interpretation out of it. For instance, you could say, “I noticed that you assigned Ann that big project I was hoping for. Would you mind telling me what went into that decision? I’d like to know why you thought I wasn’t a good fit, so that I can work on improving those skills.”

2. “This is the way it’s always been done.”

Technology-fueled change is happening so fast that even a six-month-old process could be outdated. Saying this is the way it’s always been done not only makes you sound lazy and resistant to change, but it could make your boss wonder why you haven’t tried to improve things on your own. If you really are doing things the way they’ve always been done, there’s almost certainly a better way.

3. “No problem.”

When someone asks you to do something or thanks you for doing something, and you tell them no problem, you’re implying that their request should have been a problem. This makes people feel as though they’ve imposed upon you.

What you want to do instead is to show people that you’re happy to do your job. Say something like “It was my pleasure” or “I’ll be happy to take care of that.” It’s a subtle difference in language, but one that has a huge impact on people.

4. “I think …/This may be a silly idea …/I’m going to ask a stupid question.”

These overly passive phrases instantly erode your credibility. Even if you follow these phrases with a great idea, they suggest that you lack confidence, which makes the people you’re speaking to lose confidence in you.

Don’t be your own worst critic. If you’re not confident in what you’re saying, no one else will be either. And, if you really don’t know something, say, “I don’t have that information right now, but I’ll find out and get right back to you.”

5. “This will only take a minute.”

Saying that something only takes a minute undermines your skills and gives the impression that you rush through tasks. Unless you’re literally going to complete the task in 60 seconds, feel free to say that it won’t take long, but don’t make it sound as though the task can be completed any sooner than it can actually be finished.

6. “I’ll try.”

Just like the word think, try sounds tentative and suggests that you lack confidence in your ability to execute the task. Take full ownership of your capabilities. If you’re asked to do something, either commit to doing it or offer an alternative, but don’t say that you’ll try because it sounds like you won’t try all that hard.